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      Question

      Which one of the following mineral is the main source of

      Boron in soils
      A Pyrolusite Correct Answer Incorrect Answer
      B Tourmaline Correct Answer Incorrect Answer
      C Magnetite Correct Answer Incorrect Answer
      D Muscovite Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Tourmaline is the main source of boron; Pyrolusite is a mineral consisting essentially of manganese dioxide (MnO2) and is important as an ore of manganese; Magnetite is a mineral whose primary component is an iron oxide that contains equal amounts of iron(II) and iron(III); Muscovite is the most common mineral of the mica family.

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